کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5777142 | 1632570 | 2017 | 7 صفحه PDF | دانلود رایگان |
In 1998, Reed conjectured that every graph of maximum degree Î and clique number Ï can be colored with â12(Î+1+Ï)â colors, significantly strengthening Brooks' Theorem. As evidence for his conjecture, he proved that this is true instead when the number of colors is some nontrivial convex combination of Î+1 and Ï. I 1979, ErdÅs, Rubin, and Taylor proved that a connected graph G is L-colorable for every list-assignment L satisfying |L(v)|â¥d(v) for all vâV(G), unless every block of G is a clique or odd cycle. We ask if every graph G is L-colorable for every list-assignment L satisfying |L(v)|â¥â12(d(v)+1+Ï(v))â, where Ï(v) denotes the size of the largest clique in G containing v. We prove that this is true instead when |L(v)| is some nontrivial convex combination of d(v)+1 and Ï(v), under certain mild assumptions.
Journal: Electronic Notes in Discrete Mathematics - Volume 61, August 2017, Pages 719-725